In the WHDLoad docs, and from other information sources, there is reference to a kick33192.A500 kickstart 1.2 image. Since no kick33192.A500.RTB (or corresponding Kickstart image) exists, this has been confirmed to be an error.

The correct files are kick33180.A500 kickstart 1.2 image and corresponding kick33180.A500.RTB. No WHDLoad installer currently uses these files as they've been made to work with 1.3, so there is no reason to add this kickstart.